What is the best grout for outdoor paving?

The best grout depends on the paving material, joint width and project requirements. For porcelain paving, use an epoxy grout or a fine cementitious grout suitable for narrow joints. Natural stone and concrete slabs can use most grout types, but permeable installations require a permeable grout such as brush-in or epoxy used over a permeable base. For driveways, heavy loads, large non-permeable patios or pedestrianised areas, a cementitious grout with primer offers maximum strength, durability and efficient installation.

What’s the difference between brush-in, slurry and epoxy grouts?

Brush-in grout formulas are swept into joints and activated with water, ideal for permeable patios. Slurry grout is a cementitious-based formula mixed with water and poured over primed paving, making it suitable for porcelain, driveways and larger paved areas. Epoxy grout is resin-based, highly durable and stain resistant, and is also suitable for heavy-use areas.

How do I choose the right grout for joint width?

Brush-in grouts and slurry grouts typically require joints of at least 3mm wide, though some finer formulas are suitable for joints from 2mm. Epoxy grouts are ideal for tighter joints, sometimes from 1mm. Always check the manufacturer’s minimum and maximum joint width before purchasing.

How do I choose the right grout for joint width?

Brush-in grouts and slurry grouts typically require joints of at least 3mm wide, though some finer formulas are suitable for joints from 2mm. Epoxy grouts are ideal for tighter joints, sometimes from 1mm. Always check the manufacturer’s minimum and maximum joint width before purchasing.

Do I need to apply a primer to paving slabs?

Yes. A primer is always recommended because it creates a secure bond between the bedding mortar and the paving slabs. Slabs that crack or break are often the result of them 'debonding' from the bedding mortar below.

Do I need to seal paving before grouting?

Porous stone pavers should usually be pre-sealed before grouting to reduce staining risk and make future cleaning easier. As a non-porous stone, porcelain does not require sealing, unless you prefer a satin finish.

How much paving grout do I need?

Grout coverage depends on slab size, thickness and joint width. Use our grout calculator (available for each product on our website) for accurate quantities to avoid under-ordering or waste.